Well-defined imidazolium ABA triblock copolymers as ionic-liquid-containing electroactive membranes

Chainika Jangu; Jing Han Helen Wang; Dong Wang; Sharon Sharick; James R. Heflin; Karen I. Winey; Ralph H. Colby; Timothy E. Long

doi:10.1002/macp.201400121

Well-defined imidazolium ABA triblock copolymers as ionic-liquid-containing electroactive membranes

Chainika Jangu, Jing Han Helen Wang, Dong Wang, Sharon Sharick, James R. Heflin, Karen I. Winey, Ralph H. Colby, Timothy E. Long

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

Nitroxide-mediated polymerization (NMP) affords the synthesis of well-defined ABA triblock copolymers with polystyrene external blocks and a charged poly(1-methyl-3-(4-vinylbenzyl)imidazolium bis(trifluoromethane sulfonyl)imide central block. Aqueous size-exclusion chromatography (SEC) and ¹H NMR spectroscopy studies confirm the control of the composition and block lengths for both the central and external blocks. Dynamic mechanical analysis (DMA) reveals a room temperature modulus suitable for fabricating these triblock copolymers into electroactive devices in the presence of an added ionic liquid. Dielectric relaxation spectroscopy (DRS) elucidates the ion-transport properties of the ABA triblock copolymers with varied compositions. The ionic conductivity in these single-ion conductors exhibits Vogel-Fulcher-Tammann (VFT) and Arrhenius temperature dependences, and electrode polarization (EP) analysis determines the number density of simultaneously conducting ions and their mobility. The actuators derived from these triblock copolymer membranes experience similar actuation speeds at an applied voltage of 4 V DC, as compared with benchmark Nafion membranes. These tailorable ABA block copolymers are promising candidates for ionic-polymer device applications.

Original language	English (US)
Pages (from-to)	1319-1331
Number of pages	13
Journal	Macromolecular Chemistry and Physics
Volume	215
Issue number	13
DOIs	https://doi.org/10.1002/macp.201400121
State	Published - Jul 2014
Externally published	Yes

Keywords

actuators
membranes
nitroxide-mediated polymerization

ASJC Scopus subject areas

Condensed Matter Physics
Materials Chemistry
Polymers and Plastics
Physical and Theoretical Chemistry
Organic Chemistry

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10.1002/macp.201400121

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abstract = "Nitroxide-mediated polymerization (NMP) affords the synthesis of well-defined ABA triblock copolymers with polystyrene external blocks and a charged poly(1-methyl-3-(4-vinylbenzyl)imidazolium bis(trifluoromethane sulfonyl)imide central block. Aqueous size-exclusion chromatography (SEC) and 1H NMR spectroscopy studies confirm the control of the composition and block lengths for both the central and external blocks. Dynamic mechanical analysis (DMA) reveals a room temperature modulus suitable for fabricating these triblock copolymers into electroactive devices in the presence of an added ionic liquid. Dielectric relaxation spectroscopy (DRS) elucidates the ion-transport properties of the ABA triblock copolymers with varied compositions. The ionic conductivity in these single-ion conductors exhibits Vogel-Fulcher-Tammann (VFT) and Arrhenius temperature dependences, and electrode polarization (EP) analysis determines the number density of simultaneously conducting ions and their mobility. The actuators derived from these triblock copolymer membranes experience similar actuation speeds at an applied voltage of 4 V DC, as compared with benchmark Nafion membranes. These tailorable ABA block copolymers are promising candidates for ionic-polymer device applications.",

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author = "Chainika Jangu and Wang, {Jing Han Helen} and Dong Wang and Sharon Sharick and Heflin, {James R.} and Winey, {Karen I.} and Colby, {Ralph H.} and Long, {Timothy E.}",

year = "2014",

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doi = "10.1002/macp.201400121",

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AU - Jangu, Chainika

AU - Wang, Jing Han Helen

AU - Wang, Dong

AU - Sharick, Sharon

AU - Heflin, James R.

AU - Winey, Karen I.

AU - Colby, Ralph H.

AU - Long, Timothy E.

PY - 2014/7

Y1 - 2014/7

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AB - Nitroxide-mediated polymerization (NMP) affords the synthesis of well-defined ABA triblock copolymers with polystyrene external blocks and a charged poly(1-methyl-3-(4-vinylbenzyl)imidazolium bis(trifluoromethane sulfonyl)imide central block. Aqueous size-exclusion chromatography (SEC) and 1H NMR spectroscopy studies confirm the control of the composition and block lengths for both the central and external blocks. Dynamic mechanical analysis (DMA) reveals a room temperature modulus suitable for fabricating these triblock copolymers into electroactive devices in the presence of an added ionic liquid. Dielectric relaxation spectroscopy (DRS) elucidates the ion-transport properties of the ABA triblock copolymers with varied compositions. The ionic conductivity in these single-ion conductors exhibits Vogel-Fulcher-Tammann (VFT) and Arrhenius temperature dependences, and electrode polarization (EP) analysis determines the number density of simultaneously conducting ions and their mobility. The actuators derived from these triblock copolymer membranes experience similar actuation speeds at an applied voltage of 4 V DC, as compared with benchmark Nafion membranes. These tailorable ABA block copolymers are promising candidates for ionic-polymer device applications.

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KW - membranes

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Well-defined imidazolium ABA triblock copolymers as ionic-liquid-containing electroactive membranes

Abstract

Keywords

ASJC Scopus subject areas

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